<template>
  <div :style="getPlaceholderDomStyle" v-if="getIsShowPlaceholderDom"></div>
  <div :style="getWrapStyle" :class="getClass">
    <LayoutHeader v-if="getShowInsetHeaderRef" />
    <MultipleTabs v-if="getShowTabs" />
  </div>
</template>
<script lang="ts">
  import { defineComponent, unref, computed, CSSProperties } from 'vue'

  import LayoutHeader from './index.vue'
  import MultipleTabs from '../tabs/index.vue'

  import { useHeaderSetting } from '/@/hooks/setting/useHeaderSetting'
  import { useMenuSetting } from '/@/hooks/setting/useMenuSetting'
  import { useFullContent } from '/@/hooks/web/useFullContent'
  import { useMultipleTabSetting } from '/@/hooks/setting/useMultipleTabSetting'
  import { useAppInject } from '/@/hooks/web/useAppInject'
  import { useDesign } from '/@/hooks/web/useDesign'
  import { useLayoutHeight } from '../content/useContentViewHeight'

  const HEADER_HEIGHT = 48

  const TABS_HEIGHT = 32
  export default defineComponent({
    name: 'LayoutMultipleHeader',
    components: { LayoutHeader, MultipleTabs },
    setup() {
      const { setHeaderHeight } = useLayoutHeight()
      const { prefixCls } = useDesign('layout-multiple-header')

      const { getCalcContentWidth, getSplit } = useMenuSetting()
      const { getIsMobile } = useAppInject()
      const {
        getFixed,
        getShowInsetHeaderRef,
        getShowFullHeaderRef,
        getHeaderTheme,
        getShowHeader,
      } = useHeaderSetting()

      const { getFullContent } = useFullContent()

      const { getShowMultipleTab } = useMultipleTabSetting()

      const getShowTabs = computed(() => {
        return unref(getShowMultipleTab) && !unref(getFullContent)
      })

      const getIsShowPlaceholderDom = computed(() => {
        return unref(getFixed) || unref(getShowFullHeaderRef)
      })

      const getWrapStyle = computed((): CSSProperties => {
        const style: CSSProperties = {}
        if (unref(getFixed)) {
          style.width = unref(getIsMobile) ? '100%' : unref(getCalcContentWidth)
        }
        if (unref(getShowFullHeaderRef)) {
          style.top = `${HEADER_HEIGHT}px`
        }
        return style
      })

      const getIsFixed = computed(() => {
        return unref(getFixed) || unref(getShowFullHeaderRef)
      })

      const getPlaceholderDomStyle = computed((): CSSProperties => {
        let height = 0
        if (
          (unref(getShowFullHeaderRef) || !unref(getSplit)) &&
          unref(getShowHeader) &&
          !unref(getFullContent)
        ) {
          height += HEADER_HEIGHT
        }
        if (unref(getShowMultipleTab) && !unref(getFullContent)) {
          height += TABS_HEIGHT
        }
        setHeaderHeight(height)
        return {
          height: `${height}px`,
        }
      })

      const getClass = computed(() => {
        return [
          prefixCls,
          `${prefixCls}--${unref(getHeaderTheme)}`,
          { [`${prefixCls}--fixed`]: unref(getIsFixed) },
        ]
      })

      return {
        getClass,
        prefixCls,
        getPlaceholderDomStyle,
        getIsFixed,
        getWrapStyle,
        getIsShowPlaceholderDom,
        getShowTabs,
        getShowInsetHeaderRef,
      }
    },
  })
</script>
<style lang="less" scoped>
  @prefix-cls: ~'@{namespace}-layout-multiple-header';

  .@{prefix-cls} {
    transition: width 0.2s;
    flex: 0 0 auto;

    &--dark {
      margin-left: -1px;
    }

    &--fixed {
      position: fixed;
      top: 0;
      z-index: @multiple-tab-fixed-z-index;
      width: 100%;
    }
  }
</style>
